Add T-system as a Kubeapps adopter (#6322)

### Description of the change

New use case by T-system added to the list of Kubeapps adopters

### Benefits

Information to community users about corporations using Kubeapps and
their use cases.

### Possible drawbacks

N/A

ADOPTERS.md

@@ -16,6 +16,8 @@ If you're using Kubeapps and want to add your organization to this list, follow
 
 <a href="https://www.sap.com/" border="0" target="_blank"><img alt="SAP" src="./site/content/docs/latest/img/adopters/sap.jpg" height="80"></a>
 
+<a href="https://dih.telekom.com/en" border="0" target="_blank"><img alt="T-systems" src="./site/content/docs/latest/img/adopters/t-systems.jpg" height="60"></a>
+
 <a href="https://www.terasky.com/" border="0" target="_blank"><img alt="Terasky" src="./site/content/docs/latest/img/adopters/terasky.jpg" height="50"></a>
 
 ## Success Stories
@@ -46,6 +48,10 @@ We use KubeApps to manage our production workloads which are deployed using Helm
 
 We are Team Teapots (reference to the HTTP 418 code). We manage the infrastructure of an internal Pipelines-as-a-Service offering for other development teams here at SAP. We use the wonderful Kubeapps project to help our customers deploy cloud-native applications (Jenkins, etc.) with an easy-to-use UI.
 
+**[Data Intelligence Hub (by T-Systems)](https://dih.telekom.com/en/products/#space)**
+
+We use KubeApps in our Space LivingLab product. Space LivingLab offers a sandbox environment for an experimental dataspace that is managed by us, so that the customer can fully concentrate on the development of new use cases & applications using data space technology. We use KubeApps to manage and deploy applications in a Kubernetes cluster and deploy custom Helm charts.
+
 **[Terasky](https://www.terasky.com/)**
 
 TeraSky is a Global Advanced Technology Solutions Provider. We utilize Kubeapps in many of our customers environments to provide a clean and simple UI for deploying and managing applications on kubernetes. we heavily use the multi cluster support in Kubeapps. We also heavily utilize the Carvel Packaging support in kubeapps, in order to provide a great solution for our customers in airgapped environments as well.